Welcome announcement but AFAIK not new - IIRC late LL Innes of Learney said as much in Scots Heraldry, though it may have been in a rather wordy footnote rather than the main text; & the more recent Scottish grant to Colin Powell was based on his father being a citizen of one of the Commonwealth nations in the West Indies.

But as noted, still a welcome reminder to those who may not have known.

As well as Jamaica being part of the commonwealth, HM Queen is still Jamaica's figure head. India however is also part of the commonwealth and according to the statement made by Lyon Court citizens are eligible, as a commonwealth country to apply for a grant of arms.

Those domiciled in England, Wales or Northern Ireland should approach the College of Arms in London, while those domiciled in the Republic of Ireland should approach the Chief Herald of Ireland in Dublin. Commonwealth citizens, in particular those of Scottish descent - save for Canada and South Africa which have their own heraldic authorities - can apply to the Lord Lyon King of Arms.

AH, I see.
Wasn't aware that Tonga, an independent monarchy, was a Commonwealth member.
And IIRC Fiji left the Commonwealth some years back when the army expelled the then-president - but maybe that breach has been healed.
(No value judgements expressed or implied, just surprise at seeing them on the list.)

Mike~~

Update: just read Wikipedia article on the Commonwealth & learned that Tonga, and several other nations that never were British colonies, are indeed members of the Commonwealth. However (assuming the Wiki article is up-to-date) it appears that Fiji was in the Commonwealth, suspended/withdrew & was reinstated twice, and then suspended a third time with no mention of reinstatement. (When we visited Fiji a couple of years ago, we noticed that the older paper money in circulation bore the Queen's picture, but later issuances of the same bills replaced the Queen's image with various local flora and fauna.)
FWIW.